rgba
Creates an rgba color string.
The rgba color format specifies a color using red, green, blue components, and an alpha (opacity) value. Useful for fill/stroke or style values.
Return
The rgba color string.
Parameters
r
The red component (0-255).
g
The green component (0-255).
b
The blue component (0-255).
a
The alpha component (0.0-1.0).